Every golf club has a moment-of-inertia around the center of the grip -- its MOIG. Although it's possible to roughly match your clubs by estimating MOIG, the best results are achieved when a club's precise MOIG is input into Rational Golf's BioMatch algorithm. This MOIG scale is designed with that in mind, and is ideal for golf pros who will be matching clubs for many golfers as well as for individuals wishing to improve their own game through maximizing club mathching via the BioMatch system.